Abstract
Herein, the effect of multiple laser shock peening (LSP) on fatigue performance of aluminized steel and de-twinning behavior during cyclic deformation are investigated. Results reveal their fatigue lives successively increase within LSP times ranging from 0 to 3. Instead, life degradation is noticed after 4th LSP due to damaged adsorption layer. Consequently, the negative thermal ablations release compressive residual stress and form σ phase, accelerating crack propagation. Thus, triple LSP impacts are determined as optimal condition for fatigue resistance of aluminized steel. According to twinning dislocation initiations and glide directions, the underlying de-twinning mechanisms during cyclic deformation are also discussed.
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